Section
| HS Code | 283776 |
| Product Name | SILFOAM SC 1132 High-Surfactant Silicone Antifoam Compound |
| Appearance | White to off-white viscous liquid |
| Active Content | 100% silicone antifoam compound |
| Surfactant Type | Nonionic high-surfactant package |
| Ionic Character | Nonionic |
| Specific Gravity 25c | 1.00 - 1.02 |
| Viscosity 25c | 2000 - 5000 mPa·s |
| Ph 1pct Dispersion | 6.0 - 8.0 |
| Water Dispersibility | Disperses in water with agitation to form a stable emulsion |
| Flash Point Closed Cup | >100 °C |
| Foam Suppression Character | Effective foam suppression in high-foaming aqueous systems |
| Chemical Compatibility | Compatible with nonionic, anionic, and cationic systems |
As an accredited SILFOAM SC 1132 High-Surfactant Silicone Antifoam Compound factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SILFOAM SC 1132 high-surfactant silicone antifoam compound is supplied in 55-gallon drums, sealed and labeled for safe handling. |
| Container Loading (20′ FCL) | Loaded as 80 steel drums (200 kg net each) palletized and secured, stowed carefully in a 20-foot FCL container to prevent movement. |
| Shipping | SILFOAM SC 1132 is a high-surfactant silicone antifoam compound shipped in sealed containers to prevent leakage. Non-hazardous, non-flammable, and stable under normal conditions. Protect from extreme temperatures and moisture. Ensure proper labeling and secure packing to avoid spills during transit. |
| Storage | Store SILFOAM SC 1132 in its tightly sealed original container in a cool, dry, well-ventilated area. Protect from direct sunlight, frost, and extreme heat—ideally between 5°C and 35°C. Keep away from strong oxidizers and ignition sources. Ensure the container remains closed to prevent contamination or moisture ingress. Follow manufacturer’s shelf-life recommendations. |
| Shelf Life | Shelf life is 12 months from date of manufacture when stored unopened in original containers below 25°C. |
In continuous liquid detergent compounding, the silicone antifoam compound is metered into the finished-product transfer line after the neutralization loop where linear alkylbenzene sulfonate (LAS) and alkyl ether sulfate (AES) concentrations exceed 15 wt% total active surfactant. A 1:5 to 1:10 deionized-water predispersion is injected by a positive-displacement diaphragm pump at 0.05–0.30 wt% of the finished formulation. Production-scale agitated vessels with top-entering impellers rotating at 175–350 rpm and recirculation rates of 0.5–2.0 m³/h per 1,000 L batch have been documented to entrain 8–14% air by volume during surfactant base transfer when defoaming is insufficient; the resulting density reduction alters Coriolis mass-flow calibration and leads to overfill by 0.8–1.2% in volumetric filling lines. Compliance for the formulated detergent is assessed under Regulation (EC) No 648/2004 on detergents and REACH Regulation (EC) No 1907/2006; ready biodegradability of the surfactant package is verified by OECD 301B with a 60% ThOD pass threshold, while the antifoam component is checked against REACH Annex XVII restriction entries where applicable. Terminal product types are high-efficiency (HE) liquid laundry detergents, low-foam industrial cleaner concentrates for food-processing hard surfaces, and enzyme-stabilized floor degreasers packaged in HDPE drums or IBC containers, all requiring foam collapse within 30 s after a modified Ross-Miles test per DIN EN 12728 at 40°C.
High-speed jet dyeing of cellulosic and polyester-cellulosic fabric at a liquor ratio of 1:6 generates a persistent foam collar in the main circulation chamber due to residual spinning oils, pre-treatment surfactants, and electrolyte from reactive dyeing. In a 600-kg soft-flow jet machine operating with a nozzle pressure of 0.8–1.5 bar and fabric circulation speeds of 300–600 m/min, the compound is predispersed in demineralized water at 1:5 and added through the side tank or directly to the dye bath at 0.1–0.5 g/L of total bath volume before substrate loading. In reactive dye baths containing 60–80 g/L anhydrous sodium sulfate and 15–25 g/L sodium carbonate, the dose is increased to the upper boundary only when foam height in the overflow riser exceeds 10 cm. The processing conflict is that high electrolyte concentration reduces the self-emulsification efficiency of silicone antifoam droplets, requiring a split addition: 60% of the total dose is added during the scouring phase and 40% during the neutralization phase after dye exhaustion. This split-feed prevents silicone deposition on fabric surfaces, which is evaluated by the absence of dark spots after pad-dry-cure per ISO 105-C06 wash fastness testing. Compliance is anchored to OEKO-TEX Standard 100 Annex 4 for restricted substances, ZDHC MRSL v3.0 for textile auxiliaries, and Commission Decision 2014/350/EU under the EU Ecolabel for textile products where applicable. Terminal product types are reactive-dyed cotton knit goods, polyester/cotton shirting, and elastane-containing sportswear that require foam-free processing to avoid fabric rope marking and pump cavitation.
| Dyebath electrolyte load | Dosage range | Foam height in overflow riser | Defoaming response |
|---|---|---|---|
| 0–20 g/L Na₂SO₄ | 0.10–0.20 g/L | ≤ 5 cm | Foam collapse within 15 s |
| 20–60 g/L Na₂SO₄ | 0.20–0.35 g/L | 5–10 cm | Foam collapse within 30 s |
| 60–80 g/L Na₂SO₄ | 0.35–0.50 g/L | > 10 cm | Foam collapse within 45 s, split feed required |
During wet milling of aqueous suspension concentrates containing 250–500 g/L of triazole, strobilurin, or neonicotinoid active ingredient, microfoam generation occurs in chamber-type stirred media mills charged with 0.6–0.8 mm zirconium oxide beads at a tip speed of 10–14 m/s. The compound is added at 0.1–0.5 wt% on a final formulation basis either as a pre-mill charge or via split feed to the recirculation tank; the split-feed method reduces false high-viscosity readings from an in-line Brookfield viscometer and prevents air-binding in the gear pump that transfers milled slurry to the let-down tank. Foam persistence is measured by CIPAC MT 47.2 using a 100 mL graduated cylinder after 30 inversions; a foam height below 10 mL after 1 minute is the acceptance boundary for aqueous suspension concentrates. Long-term storage stability is evaluated under CIPAC MT 46.3 at 54°C ± 2°C for 14 days; the compound must not increase particle size beyond 0.5 µm D50 when measured by laser diffraction or cause phase separation. Compliance is based on FAO/WHO pesticide specification guidelines and Regulation (EC) No 1107/2009 for plant protection products; the antifoam component is covered by the formulation's registration dossier under REACH Regulation (EC) No 1907/2006. Terminal product types are aqueous suspension concentrates, suspo-emulsions, and water-dispersible granules for crop protection and public health pest management, all requiring no persistent foam after standard reconstitution in WHO test water.
Foam control in activated sludge basins receiving 250 mg/L methylene blue active substances (MBAS) from laundry or carwash effluent is achieved by dosing the compound as a pre-diluted 1–5% emulsion into the mixed liquor at 1–20 mg/L of aeration basin volume. The dosage point is typically the return activated sludge channel or the aeration basin inlet ahead of fine-bubble diffusers; a variable-speed peristaltic pump with flow verification is used because silicone antifoam overdosing leads to surface foam depletion that reduces the oxygen transfer coefficient (kLa) by 5–12% in fine-bubble systems. The operational boundary is that the product should not be dosed directly into the secondary clarifier, where floc carryover from floating silicone droplets can increase effluent total suspended solids above the 35 mg/L limit specified in Directive 91/271/EEC. Process monitoring uses a 10 L graduated cylinder settleometer test after 30 minutes; a stable foam layer above 10 mL after 1 minute post-shaking triggers an increase in dose rate in 2 mg/L increments. Compliance references include ISO 8192:2007 for activated sludge respiration inhibition testing of the formulated product and Directive 86/278/EEC for sludge reuse in agriculture. Terminal product types are treated municipal effluent and dewatered biosolids that meet land application requirements under Directive 86/278/EEC for sludge reuse. Published data for this specific configuration is limited; the above dose rates are based on field verification in municipal plants with 3,500–5,000 mg/L mixed liquor suspended solids.
In semi-synthetic metalworking fluid concentrate manufacturing, the antifoam compound is added after the emulsifier coupling stage, when the concentrate has been cooled to 30–40°C and transferred to a day tank with a venturi eductor or low-shear inline mixer operating at 300–500 rpm. Addition levels of 0.05–0.2 wt% based on total concentrate are typical, with the lower boundary sufficient for naphthenic-oil-free semi-synthetic formulas and the upper boundary used for high-soap formulations containing 15–25% alkanolamine-neutralized sulfonates. The production process includes a 24-hour post-blending hold at 40°C to allow coalescence of entrained air before drum filling. Foaming performance of the diluted emulsion is assessed by ASTM D892-18 Sequence I, II, and III; a Sequence II foam height below 50 mL at 93.5°C is the typical acceptance limit for heavy-duty water-miscible coolants. Compliance with chemical restrictions follows REACH Regulation (EC) No 1907/2006 and CLP Regulation (EC) No 1272/2008 for hazard classification; finished fluid performance is tested under ISO 21007 for corrosion inhibition and ISO 3871 for emulsion stability. Terminal product types are semi-synthetic water-miscible coolants, soluble oil emulsions for high-pressure machining, and central system cleaners for metal-cutting plants. The primary operational incompatibility is with amine-borates at pH above 9.5, where the silicone antifoam may destabilize and form visible oiling-out in hard water.
Residual monomer stripping in carboxylated styrene-acrylic latex production requires foam suppression under vacuum to prevent latex carryover into the condenser and maintain low residual monomer below 500 ppm. The compound is post-added to the polymerization reactor at 0.05–0.30 wt% based on latex solids after the last initiator feed, immediately before the temperature is raised to 60–70°C and the pressure is reduced to 80–150 mbar for stripping. In a 20 m³ jacketed stainless steel reactor with anchor agitator running at 40–60 rpm, excessive foam during stripping reduces the effective condensation surface area and extends the stripping cycle by 20–40 minutes; the antifoam compound collapses the foam within 10–15 seconds and allows the vacuum to be deepened to the set point. Latex quality is checked for coagulum content by filtration through a 75 µm sieve according to ISO 4576, and viscosity is measured by ISO 1652; no significant shift in average particle size by disc centrifuge is observed when the addition rate remains below 0.30 wt%. Compliance references are REACH Regulation (EC) No 1907/2006 for polymer monomers and additives, EU Directive 2004/42/CE for volatile organic content of coatings, and FDA 21 CFR 176.170 for components of paper and paperboard in dry food contact where the latex is used as a coating binder. Terminal product types include acrylic and styrene-acrylic latex dispersions for architectural coatings, paper and board coatings, and pressure-sensitive adhesives.
In paper and board production using recovered fiber, white water from the wire section carries dissolved and colloidal substances, starch, and synthetic retention aids that stabilize foam in the tray channel and cause sheet defects when foam globules rise under the slice. The compound is dosed as a 0.5–2.0% dilution into the white-water silo or the fan pump suction at 0.1–0.5 kg/t of dry fiber production; the dose is adjusted by the foam index measured in a 2 L graduated cylinder after 10 seconds of mechanical shaking. Process integration is sensitive: addition directly into the thick stock ahead of the fan pump can reduce the efficiency of cationic retention aids by 2–5%, so the preferred point is the wire pit where the fiber mat has already formed. Compliance for food-contact paper and board is anchored to FDA 21 CFR 176.170 and BfR Recommendation XXXVI for paper and board intended for contact with dry and fatty foodstuffs, with overall migration tested under DIN EN 1186 where applicable. Terminal product types are recycled linerboard, corrugating medium, and tissue, which require defect-free sheet formation and stable drainage without foam entrainment. The operational boundary is that excessive dose above 0.5 kg/t can reduce sheet strength by up to 4% due to hydrophobic spots; published data for this specific configuration is limited, and mill-scale validation is required.
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SILFOAM SC 1132 High-Surfactant Silicone Antifoam Compound is a water-dispersible, silicone-based foam-control agent supplied as a viscous liquid for concentrated surfactant formulations. The product is based on a hydrophobic silica–polydimethylsiloxane system carried in a high-surfactant package that permits dispersion under moderate agitation in cold water. This composition distinguishes the material from conventional dimethylpolysiloxane–silica compounds, which require separate emulsification, and from ready-to-use silicone emulsions, which contain a continuous water phase and typically require preservation. The product is intended for use in liquid detergents, industrial cleaners, textile auxiliaries, and aqueous polymer dispersions where foam generation arises from anionic or nonionic surfactant loading under mechanical shear. Characterization of the as-supplied material is normally performed using ISO 2555 for Brookfield viscosity, ISO 2811-1 for density, and ISO 976 for pH; lot-specific release values are provided on the certificate of analysis because the manufacturing specification window is narrower than the generic class range.
Typical published property ranges are as follows: appearance is a milky white to slightly yellowish viscous liquid; Brookfield viscosity at 25 °C according to ISO 2555 is 1,500–3,500 mPa·s; density at 25 °C according to ISO 2811-1 is 0.98–1.03 g/cm³; neat pH according to ISO 976 is 6.0–8.5. These values are target ranges for quality control; the certificate of analysis for each batch contains the actual release data.
In laundry and automatic dishwashing concentrates containing 15–40 wt% total surfactants plus builders, conventional hydrophobic silica–silicone oil defoamers may become over-dispersed during pump recirculation. The resulting submicrometer droplets can be sequestered inside surfactant micelles, reducing the defoamer population available at the air–liquid interface. SILFOAM SC 1132 is formulated with a high-surfactant carrier that shifts the droplet size distribution toward a coarser, more persistent dispersion when diluted in such media. Foam-control efficacy in this context is evaluated by dynamic foam-height reduction tests based on ASTM E2407 or by plant-specific recirculation rigs with controlled air entrainment. In these rigs, the compound is injected at product concentrations between 20 ppm and 500 ppm relative to the wash liquor, with the lower boundary applicable to low-soil industrial cleaning and the upper boundary to highly built formulas containing optical brighteners and polymers. The critical threshold for underdosing is usually observed as foam carry-over into the recirculation pump suction, while overdosing can produce visible silicone spotting on hydrophobic textile surfaces.
On multi-product liquid detergent filling lines, SILFOAM SC 1132 is metered into a stirred mixing vessel after neutralization and before final viscosity adjustment. The compound is introduced through a progressive cavity pump or a peristaltic pump equipped with a 6–10 mm ID tube and a static mixer with 6–12 elements; batch-to-batch variance in foam height has been observed to decrease when the injection point is located upstream of the recirculation loop rather than directly at the vessel top. A wall shear rate above 1,000 s⁻¹ during in-line dispersion can reduce the median droplet size and shorten defoaming persistence, so post-addition mixing should use an agitator tip speed below 1.5 m/s in a 1,000 L conical-bottom vessel. The product can be prediluted with demineralized water at a 1:1 to 1:5 ratio by mass, but the dilute dispersion must be used within the same production campaign because it does not exhibit the same storage stability as the as-supplied compound.
When a manufacturing site replaces a 10–20 wt% active silicone emulsion with SILFOAM SC 1132 in a continuous dosing loop, the mass-based dose cannot be transferred directly. The compound contains less water and therefore requires recalculation of the active silicone feed rate. In continuous overflow washing lines, the compound maintains defoaming under high electrolyte and high alkalinity because it is less sensitive to dilution shock than many emulsion products. However, the as-supplied viscosity is higher than that of ready-to-use emulsions, so suction-side pump selection must account for a viscosity of at least 1,000 mPa·s at 25 °C and the corresponding NPSH margin. A comparative evaluation matrix normally includes foam height after 60 min recirculation, visual assessment of surface oil, and turbidity of the drained liquor after 24 h settling.
| Parameter | Conventional silicone emulsion | SILFOAM SC 1132 compound |
|---|---|---|
| Active silicone content | Low, 10–20 wt% | Concentrated; lot-specific |
| Continuous water phase | Present | Absent or low |
| Freeze-thaw sensitivity | High; ice crystal rupture possible | Lower |
| Preservative demand | Typically required | Not typically required in anhydrous or low-water form |
| Dosing viscosity | Low, pumpable | Higher; requires viscosity-corrected pump sizing |
Under production transfer conditions, the as-supplied compound exhibits shear-thinning behavior; Brookfield spindle configurations may show apparent viscosity values that decline with increasing spindle speed. For transfer line sizing, a rotational rheometer with cone-plate geometry in accordance with ISO 3219 provides a viscosity curve over 0.1–100 s⁻¹. Below 0.1 s⁻¹, the silica network can produce yield-like behavior, which is why progressive cavity pumps are preferred over centrifugal pumps. Pressure drop calculations for DN25 piping at 20 °C should use the viscosity at the actual wall shear rate rather than a single Brookfield point. This avoids under-sizing of the feed pump during winter months when viscosity can rise by a factor of two or more.
In spray-dried heavy-duty powder production, foam in the slurry feed can reduce atomization efficiency and increase bulk density variation. SILFOAM SC 1132 is added to the slurry before the high-pressure pump at a concentration determined by foam-height tests under vacuum. Because the compound must survive mechanical shearing in the atomizer, its high-surfactant carrier provides a reservoir of surface-active material that maintains the silicone actives in a dispersed state. The critical control point is the slurry hold tank: if the residence time exceeds 30 min, the dispersion may cream, and the feed to the spray tower becomes non-representative. Transfer lines should therefore be designed with recirculation and low-shear agitation rather than dead zones.
Storage of the unopened product should be within 5 °C to 35 °C in sealed stainless steel or high-density polyethylene containers. Viscosity increases measurably below 10 °C; before pumping, the product should be equilibrated to 20–25 °C and gently rolled or stirred without high shear. Wetted parts for continuous dosing are normally constructed of AISI 316L stainless steel, polypropylene, or PTFE; elastomer seals should be selected from EPDM or PTFE-encapsulated O-rings, while direct contact with unsealed silicone rubber components should be avoided because of potential swelling. The compound is not classified as readily flammable under normal storage conditions, but the safety datasheet issued under Regulation (EC) 1907/2006 Annex II must be consulted for local storage and spill control measures.
In textile jet dyeing equipment with pump-induced foam, SILFOAM SC 1132 is metered as a pre-diluted feed into the machine reserve tank at a concentration of 0.05–0.20 g/L of bath. The high-surfactant carrier permits addition in the presence of levelling agents and electrolytes without immediate oil separation. Machine operators monitor foam collapse time in the overflow section; when the collapse time exceeds 15 s, the feed rate is adjusted upward in 10% increments. For paper stock defoaming, the product can be fed to the white-water loop after the fan pump, but published data for this specific configuration is limited because retention aid interactions and pH shifts require mill-specific validation.
In systems using mass flow meters calibrated for low-viscosity emulsions, the compound can be diluted with demineralized water or with a small fraction of the formulation’s nonionic surfactant to reduce viscosity below 500 mPa·s. A static mixer with 12 elements placed after the dilution point produces a homogeneous coarse dispersion when the line velocity is maintained above 0.3 m/s. The viscosity of the diluted stream is measured according to ISO 2555; the pH of the dilution water should be kept between 5.0 and 8.0 to avoid premature hydrolysis of the carrier surfactants. Long hold times in dilution tanks are not recommended because the dispersed silicone droplets can coalesce or cream, causing inconsistent metering at start-up.
In clean-in-place systems for food and beverage plants, foam can obstruct spray balls and reduce line pressure. The compound is dosed into the alkaline detergent stream at 0.02–0.10 g/L of cleaning solution during recirculation. The high-surfactant carrier is compatible with sodium hydroxide and sodium hypochlorite under typical use concentrations, but prolonged contact with strong oxidizing agents may degrade the silicone backbone. Operators should avoid pre-mixing with concentrated bleach before dilution because localized oxidation can form silanol species that lose foam-control activity.
Unlike self-emulsifying silicone fluids optimized for very low addition rates in clear liquids, SILFOAM SC 1132 is designed for turbid or built formulations where visible clarity is not a primary specification. The compound is not suitable for anhydrous solvent-borne systems because the high-surfactant carrier may phase-separate; in such systems, a solvent-free silicone oil–silica compound or a fluorosilicone grade is normally required. The product is also not intended for direct food-contact applications unless the specific regulatory clearance has been confirmed in writing; 21 CFR 175.300 or 21 CFR 176.210 assessments must be completed for the final formulation, and published data for this specific product in food-contact packaging is limited. In formulations containing high levels of cationic surfactants, bench-scale compatibility tests are required before scaling because cationic species can invert the carrier charge distribution and destabilize the dispersion.
| Area | Standard / regulation | Relevant parameter |
|---|---|---|
| Viscosity | ISO 2555 | Brookfield viscosity at 25 °C |
| Density | ISO 2811-1 | Liquid density at 25 °C |
| pH | ISO 976 | Neat pH |
| Foam performance | ASTM E2407 | Defoaming efficacy in test media |
| Safety data | Regulation (EC) 1907/2006 Annex II | SDS format and exposure control |
| EU chemical inventory | REACH | Registration status |
Where local effluent permits require, the silicone content in waste streams is determined by extraction or by inductively coupled plasma optical emission spectrometry after acid digestion; the selection of method depends on the reporting limit required by the discharge permit. Published data for this specific compound in municipal wastewater treatment plants is limited, so bench-scale treatability tests are recommended before full-scale use.
